Flue gas deamination system

Abstract

The utility model provides a flue gas deamination system. The flue gas deamination system comprises a gas inlet pipeline, a deamination tower and a deamination agent adding device. The deamination tower comprises a shell, the shell is provided with a cavity, a gas inlet and a gas outlet, the gas inlet and the gas outlet are communicated with the cavity, and the gas inlet is connected with the gas inlet pipeline; the deamination tower is used for removing ammonia in flue gas from the gas inlet pipeline; and the deamination agent adding device is communicated with the cavity and is used for adding a deamination agent into the cavity. The flue gas deamination system provided by the utility model is high in deamination efficiency and low in cost.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental protection, in particular to a flue gas deammoniation system. Background Art

[0002] With the NO x Emission limits are getting lower and lower, and many regions require 80mg / m 3 , even 50mg / m 3 To meet this requirement, the flue gas after waste incineration needs to be deammonified, but whether it is the traditional SNCR or the emerging polymer denitrification technology, it will lead to an increase in the excess of reduced ammonia and serious ammonia escape.

[0003] At present, SCR uses SCR catalyst to reduce excess ammonia in flue gas, but the operating temperature of SCR catalyst is relatively high, at least above 170 degrees, in order to avoid clogging of the pores by ammonium sulfate salts, so the flue gas needs to be heated, resulting in extremely high operating costs. However, when the operation time is slightly longer, ammonium sulfate salts will still clog the pores of SCR catalysts. Utility Model Content

[0004] The main purpose of the utility model is to provide a flue gas deamination system, aiming to reduce operating costs and improve deamination efficiency.

[0005] In order to achieve the above object, the utility model provides a flue gas deammoniation system, comprising:

[0006] Intake duct,

[0007] A deamination tower, the deamination tower comprises a shell, a cavity, and an air inlet and an air outlet both connected to the cavity, the air inlet is connected to the air inlet pipe; the deamination tower is used to remove ammonia from the flue gas coming from the air inlet pipe;

[0008] A deamination agent adding device is connected to the cavity and adds a deamination agent into the cavity.

[0009] Preferably, the deammoniation agent adding device comprises a dosing box, a dosing pipeline and a dosing pump arranged on the dosing pipeline.

[0010] Preferably, the medicine dosing box includes a medicine supply bin and a mixing bin, the mixing bin is provided with a medicine inlet, a water inlet and a medicine outlet, the medicine inlet is connected to the medicine supply bin, the water inlet is connected to the water tank, and the medicine outlet is connected to the medicine dosing pipeline.

[0011] Preferably, the dosing pipeline includes a straight pipe and a curved pipe adapted to the outer wall of the deamination tower, the water inlet of the curved pipe is connected to the straight pipe, and the water outlet of the curved pipe is connected to the deamination tower; the curved pipe includes at least one water outlet.

[0012] The deamination tower also includes:

[0013] A spraying device is provided in the cavity and between the air inlet and the air outlet, and is used for spraying the deammoniation slurry;

[0014] A demisting device, disposed in the cavity and between the spraying device and the air outlet;

[0015] A cleaning device is connected to the demisting device and is used for introducing water into the demisting device for cleaning.

[0016] Preferably, the spray device comprises a plurality of spray layer structures arranged along the air flow direction, and the spray layer structure comprises a plurality of nozzles.

[0017] Preferably, the cleaning device comprises a cleaning water tank, a water outlet pipe and a water pump arranged on the water inlet pipe, one end of the water outlet pipe is connected to the cleaning water tank, and the other end is connected to the demisting device.

[0018] Preferably, the deamination tower also includes: a cooling device, which is arranged at the air inlet or in the air inlet pipe to cool the flue gas flowing into the cavity; the cooling device includes a spray pipe, and the spray pipe is provided with a plurality of nozzles, and the nozzles are at least arranged in the direction of flue gas entry.

[0019] Preferably, the air inlet is arranged at the lower part of the cavity, the air outlet is arranged at the top of the cavity, and the deamination tower further comprises:

[0020] A water storage portion, disposed between the air inlet and the bottom of the cavity;

[0021] A first circulation pipeline is arranged outside the shell and connects the water storage part and the spray device;

[0022] The second circulation pipeline is arranged outside the shell and connects the water storage part and the cooling device.

[0023] Preferably, the incinerator is a negative pressure incinerator, and the flue gas deammoniation system further comprises:

[0024] A booster fan, arranged on the air inlet duct, for pressurizing the flue gas;

[0025] A flue gas bypass duct is arranged outside the shell and connects the air inlet and the air outlet;

[0026] The flue gas bypass valve is arranged on the flue gas bypass pipe.

[0027] In the technical solution provided by the utility model, the flue gas deamination system includes an air intake pipe, a deamination tower, and a deamination agent adding device. The deamination tower is used to remove ammonia from the flue gas coming from the air intake pipe. The utility model adds a deamination agent to the cavity through the deamination agent adding device, which can effectively improve the deamination efficiency. In addition, the system provided by the utility model is simple, easy to operate and maintain, can operate stably for a long time, and has low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0029] Figure 1 A three-dimensional schematic diagram of an embodiment of a flue gas deammonification system provided by the utility model.

[0030] Description of Figure Numbers:

[0031] Label name Label name 100 Flue gas deamination system 2 Deamination agent adding device 1 Deamination tower 21 Medicine box 11 case 22 Dosing pipe 12 Cavity 23 Dosing pump 13 Air Inlet 3 Cleaning device 14 Air outlet 4 First circulation pipeline 15 Spraying device 5 Second circulation pipeline 16 Demisting device 6 Booster fan 17 Air uniformity device 7 Flue gas bypass duct 18 Cooling device 19 Water storage department

[0032] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0036] With the NO x Emission limits are getting lower and lower, and many regions require 80mg / m 3 , even 50mg / m 3 To meet this requirement, the flue gas after waste incineration needs to be deammonified, but whether it is the traditional SNCR or the emerging polymer denitrification technology, it will lead to an increase in the excess of reduced ammonia and serious ammonia escape.

[0037] At present, SCR uses SCR catalyst to reduce excess ammonia in flue gas, but the operating temperature of SCR catalyst is relatively high, at least above 170 degrees, in order to avoid clogging of the pores by ammonium sulfate salts, so the flue gas needs to be heated, resulting in extremely high operating costs. However, when the operation time is slightly longer, ammonium sulfate salts will still clog the pores of SCR catalysts.

[0038] In view of this, the utility model provides a flue gas deammoniation system. Figure 1 This is an embodiment provided by the utility model.

[0039] See also Figure 1 The flue gas deamination system 100 includes an air intake pipe, a deamination tower 1, and a deamination agent adding device 2. The deamination tower 1 includes a shell 11, which is provided with a cavity 12 and an air inlet 13 and an air outlet 14 both connected to the cavity 12, and the air inlet 13 is connected to the air intake pipe; the deamination tower 1 is used to remove ammonia from the flue gas coming from the air intake pipe; the deamination agent adding device 2 is connected to the cavity 12 to add a deamination agent to the cavity 12.

[0040] In the technical solution provided by the utility model, the flue gas deamination system 100 includes an air intake pipe, a deamination tower 1, and a deamination agent adding device 2. The deamination tower 1 is used to remove ammonia from the flue gas coming from the air intake pipe. The utility model adds a deamination agent to the cavity 12 through the deamination agent adding device 2, which can effectively improve the deamination efficiency. In addition, the system provided by the utility model is simple, easy to operate and maintain, can operate stably for a long time, and has low cost.

[0041] It should be noted that the deamination agent may be an acidic substance or a substance that can react physically or chemically with ammonia for adsorption.

[0042] In some embodiments, the deamination agent adding device 2 includes a dosing box 21, a dosing pipeline 22, and a dosing pump 23 arranged on the dosing pipeline 22. Specifically, the dosing box 21 includes a drug supply bin and a mixing bin, and the mixing bin is provided with a drug inlet, a water inlet, and a drug outlet. The drug inlet is connected to the drug supply bin, the water inlet is connected to the water tank, and the drug outlet is connected to the dosing pipeline. Thus, the deamination agent stored in the drug supply bin enters the mixing bin through the drug inlet of the mixing bin, mixes with the water entering the mixing bin through the water inlet, enters the cavity through the drug outlet, and adds the deamination agent to the cavity.

[0043] In some embodiments, the dosing pipeline includes a straight pipe and a curved pipe adapted to the outer wall of the deamination tower, the water inlet of the curved pipe is connected to the straight pipe, and the water outlet of the curved pipe is connected to the deamination tower; the curved pipe includes at least one water outlet.

[0044] In some embodiments, the deammoniation tower 1 further comprises a spray device 15, a demisting device 16 and a cleaning device 3. The spray device 15 is disposed in the cavity 12 and between the air inlet 13 and the air outlet 14 to spray the deammoniation slurry; the demisting device 16 is disposed in the cavity 12 and between the spray device 15 and the air outlet 14; the cleaning device 3 is connected to the demisting device 16 to pass water into the demisting device 16 for cleaning.

[0045] In some embodiments, the cleaning device 3 includes a cleaning water tank, a water outlet pipe, and a water pump arranged on the water inlet pipe, one end of the water outlet pipe is connected to the cleaning water tank, and the other end is connected to the defogger 16. Thus, the water in the cleaning water tank can be pumped into the defogger 16 by the water pump to clean the defogger 16.

[0046] It should be noted that the deammoniation slurry can be water, an acidic substance, or a substance that can react physically or chemically with ammonia for adsorption. The demister 16 is a demister with a wire mesh structure, which can intercept small droplets in the flue gas by fully mixing with the flue gas, forming large droplets, and then falling by gravity. The cleaning water tank 3 can clean the demister 16 regularly to clean the crystallized substances on the demister 16.

[0047] In some embodiments, the spray device 15 includes a multi-layer spray layer structure arranged along the airflow direction, and the spray layer structure includes a plurality of nozzles. The deammoniation slurry sprayed by the multi-layer spray layer structure forms a liquid surface that completely blocks the flue gas channel. When the flue gas passes through the liquid surface, ammonia is removed by the adsorption reaction of the deammoniation agent in the deammoniation slurry.

[0048] In some embodiments, the deamination tower 1 further includes: a uniform wind device 17, including uniformly distributed air flow holes, disposed between the air inlet 13 and the spray device 15. Since the flow field of flue gas is turbulent after entering the deamination tower 1, the uniform wind device 17 is disposed between the air inlet 13 and the spray device 15 to regulate the flow field.

[0049] In some embodiments, the deamination tower 1 further includes: a cooling device 18, which is arranged at the air inlet 13, and the cooling device 18 includes a cooling spray pipe, and the cooling spray pipe is provided with a plurality of nozzles, and the nozzles are arranged along the flow direction of the flue gas. It should be noted that the deamination slurry generally needs to be operated in a temperature range of 50-120 degrees, but the flue gas temperature of the incinerator is relatively high. The cooling device 18 is arranged at the inlet flue of the deamination tower 1, which can preliminarily cool the flue gas and perform preliminary deamination treatment.

[0050] In some embodiments, the air inlet 13 is arranged at the lower part of the cavity 12, and the air outlet 14 is arranged at the top of the cavity 12, and the deammonification tower 1 also includes: a water storage part 19 and a first circulation pipeline 4, wherein the water storage part 19 is arranged between the air inlet 13 and the bottom of the cavity 12; the first circulation pipeline 4 is arranged outside the shell 11, connecting the water storage part 19 and the spraying device 15.

[0051] It should be noted that a circulation pump can be provided on the first circulation pipeline 4, so that the deammoniation slurry in the water storage part 19 can be circulated and sprayed in the deammoniation tower 1 by the circulation pump until saturation. The saturated deammoniation waste liquid in the water storage part 19 at the bottom of the deammoniation tower 1 can be discharged into the leachate treatment station of the waste incineration plant through a pipeline at regular intervals, and after being treated by dilution, neutralization, filtration and other links, concentrated water is formed for industrial production in the plant.

[0052] In some embodiments, the deamination tower 1 further includes a second circulation pipeline 5, which is disposed outside the shell 11 and connects the water storage part 19 and the cooling device 18. A circulation pump can be provided on the second circulation pipeline 5, so that the liquid in the water storage part 19 can be circulated to the cooling device 18 through the circulation pump, which is conducive to reducing costs.

[0053] In some embodiments, the incinerator is a negative pressure incinerator, and the flue gas deammoniation system 100 further includes:

[0054] The booster fan 6 is arranged on the air inlet duct and is used to pressurize the flue gas. The flue gas enters the deamination tower 1 after passing through the booster fan 6. It should be noted that the air inlet duct can be connected to the incinerator of the waste incineration power plant. Under normal circumstances, in order to ensure the stable operation of the incinerator, the waste incineration power plant needs to operate at negative pressure, that is, the incinerator is a negative pressure incinerator. After adding the deamination system, the resistance increases, resulting in a slight positive pressure in the incinerator, which is not conducive to stable operation. The booster fan 6 is arranged in front of the deamination tower 1 to overcome the resistance along the way and ensure the slight negative pressure operation of the incinerator.

[0055] In some embodiments, the flue gas deamination system 100 further includes: a flue gas bypass pipe 7, which is arranged outside the shell 11 and connects the air inlet 13 and the air outlet 14; and a flue gas bypass valve, which is arranged on the flue gas bypass pipe 7. Therefore, when the deamination system is in a cleaning or other link that may affect the working conditions of the rear flue, the entire deamination system can be closed by the valve arranged on the flue, and then the flue gas bypass valve is opened, and the flue gas is directly discharged from the chimney after passing through the flue gas bypass pipe 7. When the deamination system is working normally, the flue gas bypass valve is in a closed state, and the flue gas normally enters the deamination tower 1 from the air inlet 13 of the deamination tower 1.

[0056] In some embodiments, a corrosion-resistant layer is provided on the inner surface of the shell 11 of the deamination tower 1. The flue gas from garbage incineration contains a lot of acidic gases such as HCl, HF, SO2, etc. After cooling to the acid dew point, acid liquid will be formed, which will cause great corrosion to the deamination tower 1, flue, fan, etc. In the utility model, all equipment and flue surfaces that come into contact with the cooled flue gas can be sprayed with a corrosion-resistant layer, and the material of the corrosion-resistant layer can be plastic or rubber.

[0057] Taking the example of connecting the flue gas deamination system provided by the utility model to the incinerator of the garbage incineration power plant and treating the flue gas generated by the incinerator, the working principle of the utility model is as follows: the flue gas generated by the incinerator is pressurized by the original induced draft fan and the booster fan 6, and then enters the deamination tower 1. After the flue gas is initially cooled to 80-120 degrees by the cooling device at the inlet flue, it passes through the liquid surface formed by the circulating deamination slurry sprayed by the spray device in the spray layer from bottom to top. After continuously passing through several set layers of deamination spray liquid surfaces, the ammonia in the flue gas is completely removed by physical or chemical adsorption of the water in the deamination slurry and the acidic substances or substances that can absorb ammonia. Then, most of the small droplets in the flue gas are intercepted by the defogger to form large droplets, which fall to the slurry pool at the bottom of the deamination tower 1 by gravity, and the flue gas is discharged from the top of the deamination tower 1 through the chimney. The deammoniation agent is pumped into the deammoniation tower 1 through the dosing pump in the dosing box, and automatic dosing control is implemented according to the liquid level at the bottom of the tower. A deammoniation slurry circulation pump can be set on the first circulation pipeline, and the deammoniation slurry circulation pump automatically controls the opening of the deammoniation slurry circulation pump according to the concentration of ammonia escape. The clean water tank sprays water to clean the demisting device that may crystallize according to the set time. In order to eliminate the impact on the rear flue during cleaning, the entire deammoniation system can be closed through a valve, and the flue gas is discharged directly from the chimney through the flue gas bypass pipe. After the slurry at the bottom of the deammoniation tower 1 is saturated with ammonia, it is discharged into the leachate treatment station of the waste incineration power plant through a pipeline at a fixed time, and then treated after dilution and neutralization.

[0058] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the concept of the utility model, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A flue gas deammonification system, characterized in that: include: Intake duct; A deamination tower, the deamination tower comprises a shell, a cavity, and an air inlet and an air outlet both connected to the cavity, the air inlet is connected to the air inlet pipe; the deamination tower is used to remove ammonia from the flue gas coming from the air inlet pipe; A deamination agent adding device is connected to the cavity and adds a deamination agent into the cavity.

2. The flue gas deamination system according to claim 1, characterized in that: The deammoniation agent adding device comprises a dosing box, a dosing pipeline and a dosing pump arranged on the dosing pipeline.

3. The flue gas deamination system according to claim 2, characterized in that: The medicine adding box includes a medicine supply bin and a mixing bin. The mixing bin is provided with a medicine inlet, a water inlet and a medicine outlet. The medicine inlet is connected to the medicine supply bin, the water inlet is connected to the water tank, and the medicine outlet is connected to the medicine adding pipeline.

4. The flue gas deamination system according to claim 2, characterized in that: The dosing pipeline includes a straight pipe and a curved pipe adapted to the outer wall of the deamination tower, the water inlet of the curved pipe is connected to the straight pipe, and the water outlet of the curved pipe is connected to the deamination tower; the curved pipe has at least one water outlet.

5. The flue gas deamination system according to claim 1, characterized in that: The deamination tower also includes: A spraying device is provided in the cavity and between the air inlet and the air outlet, and is used for spraying the deammoniation slurry; A demisting device, disposed in the cavity and between the spraying device and the air outlet; A cleaning device is connected to the demisting device and is used for introducing water into the demisting device for cleaning.

6. The flue gas deamination system according to claim 5, characterized in that: The spray device comprises a plurality of spray layer structures arranged along the air flow direction, and the spray layer structures comprise a plurality of nozzles.

7. The flue gas deamination system according to claim 5, characterized in that: The cleaning device comprises a cleaning water tank, a water outlet pipe and a water pump arranged on the water inlet pipe. One end of the water outlet pipe is connected to the cleaning water tank, and the other end is connected to the demisting device.

8. The flue gas deamination system according to claim 5, characterized in that: The deamination tower also includes: A cooling device, arranged at the air inlet or in the air inlet duct, to cool the smoke flowing into the cavity; The cooling device comprises a spray pipe, on which a plurality of nozzles are arranged, and the nozzles are arranged at least in the direction in which smoke enters.

9. The flue gas deamination system according to claim 8, characterized in that: The air inlet is arranged at the lower part of the cavity, the air outlet is arranged at the top of the cavity, and the deamination tower further comprises: A water storage portion, disposed between the air inlet and the bottom of the cavity; A first circulation pipeline is arranged outside the shell and connects the water storage part and the spray device; The second circulation pipeline is arranged outside the shell and connects the water storage part and the cooling device.

10. The flue gas deammonification system according to claim 1, characterized in that: The flue gas deamination system also includes: A booster fan, arranged on the air inlet duct, for pressurizing the flue gas; A flue gas bypass duct is arranged outside the shell and connects the air inlet and the air outlet; The flue gas bypass valve is arranged on the flue gas bypass pipe.

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